[youtube] Improve age-gated videos extraction (closes #27259)
[youtube] Improve age-gated videos extraction (closes #27259)

spvkgn/youtube-dl,rg3/youtube-dl,ozburo/youtube-dl,rg3/youtube-dl,yan12125/youtube-dl,ozburo/youtube-dl,yan12125/youtube-dl,Tatsh/youtube-dl,spvkgn/youtube-dl,Tatsh/youtube-dl